draagmoment

Draagmoment, in structural engineering, is the internal bending moment that a member must resist to maintain equilibrium under applied loads. It represents the rotational effect of forces about a cross-section and is a critical component of the internal stress state in beams, frames, and other load-bearing elements.

Draagmoment arises when external loads produce turning effects that do not pass through the member’s centroid. It combines with axial force and shear to determine the complete distribution of stresses across cross-sections and governs safety and serviceability in design.

Calculation and notation: The bending moment M(x) at a section along a member is the internal moment that resists rotation, and it is obtained from the shear force V(x) by M'(x) = V(x) in differential form. In simple beam problems, Mmax can be obtained from standard cases: a simply supported beam with a central point load F has Mmax = F L / 4, while a uniformly distributed load w yields Mmax = w L^2 / 8. Sign conventions vary by region.

Design and assessment: Draagmoment is used with the bending stress equation sigma = M c / I to check that material strength and cross-sectional geometry are sufficient. Engineering codes specify allowable moments and provide methods to distribute moments (moment distribution) and to verify safety margins. It is related to draagvermogen, the carrying capacity, but refers specifically to the internal moment produced by loads rather than the ultimate load-bearing limit.

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